Solder resist opening to define a combination pin one indicator and fiducial

ABSTRACT

The present invention features a novel design for a fiducial and pin one indicator that utilizes a single solder resist opening in a die mounting substrate to perform the combined functions of prior art fiducials and pin one indicators. Methods of fabricating a carrier substrate and fabricating a semiconductor device package using the combination pin one indicator and alignment fiducial of the present invention are also provided.

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application is a divisional of application Ser. No.09/888,674, filed Jun. 25, 2001, pending.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] This invention relates generally to ball grid array packages.More specifically, this invention relates to a method of using a singlesolder resist opening on a ball grid array substrate as both a sawfiducial and a pin one indicator.

[0004] 2. State of the Art

[0005] Integrated circuits (ICs) are typically fabricated on asemiconductor wafer. To achieve the many semiconductor devices which maybe formed thereon, the semiconductive wafer is subjected to deposition,etching, planarization and lithographic processes. The wafer is then cutor “diced” to form multiple semiconductor die (dice) or semiconductordevices (IC chips). Typically, these individual semiconductor devicesare transferred to a mounting substrate by an automatic “pick and place”process. Thereafter, a semiconductor device is electrically connected tothe substrate and encapsulated by a molding apparatus into a finalpackage. As trends continue towards higher performance, highinput/output, and high board-manufacturing-yield, Ball Grid Array (BGA)packaging has become the technology of choice. In an ever increasingnumber of semiconductor applications, therefore, semiconductor devicesor IC chips are mounted onto printed circuit boards or other mountingsubstrates which utilize BGA packaging methods.

[0006] Currently, some types of BGA packages, including fine pitch ballgrid array (FPBGA) and micro ball grid array (μBGA) semiconductor devicepackages, are known in the art. The various types of BGA packages thathave been developed include BGAs mounted on printed wiring boards,leadframes, and flexible tape. Presently, due to the need for smallerdevices having a higher lead count and a smaller footprint, BGAs areused in chip scale packaging with increasing frequency.

[0007] One type of BGA package, known as “board-on-chip,” is shown indrawing FIGS. 1 and 2. A board-on-chip BGA package 1 typically comprisesa substrate 10 having an upper or top surface 12, an opposing bottomsurface 16, and an elongated aperture 15 extending through the middlethereof. Substrate 10 is typically a polymer laminate printed circuitboard, although ceramics and other types of substrates may be used.During a die attach process, a semiconductor die 20 is mounted on thebottom surface 16 of the substrate 10 using an adhesive, adhesive andtape and/or adhesively coated tape, having active surface 22 ofsemiconductor device 20 upwardly facing and positioned below aperture15. Active surface 22 of semiconductor device 20 is configured having aplurality of bond pads 24 in single or multiple columns thereon whichare substantially aligned with aperture 15 as illustrated therein. Asillustrated in drawing FIG. 1, bond pads 24 can be viewed throughaperture 15 as they are substantially aligned. Upper surface 12 ofsubstrate 10 comprises a conductor surface wherein circuit traces 17 areformed, typically by etching, in a desired pattern. Alternatively,circuit traces 17 are formed on the semiconductor device side ofsubstrate 10, or are formed internally within substrate 10. Circuittraces 17 are interconnected with a plurality of bond pads 18 and anarray of contact pads 19 located along the periphery of aperture 15 andextending from circuit traces 17, respectively. Bond pads 18 and contactpads 19 are generally located at separate terminal ends of circuittraces 17, as can be seen in drawing FIG. 1. Contact pads 19 are formedin arrays of varying numbers, dependent upon the specific application ofthe package. Each contact pad 19 typically comprises a solderablesurface mount pad which is formed of a conductive metal, such as copper.

[0008] As shown in drawing FIG. 2, substrate 10 also includes alaminated or screen printed solder resist layer, or solder mask 40.Solder mask 40 is formed over top and bottom surfaces 12 and 16 andcomprises an electrically insulating, low surface tension material whichshields conductive members on top and bottom surfaces 12 and 16,respectively, from subsequent soldering and/or plating operations thatmight result in electrical shorts. The layer of solder resist comprisingsolder mask 40 initially may, if desired, cover all portions of surfaces12 and 16 (including bond pads 18 and contact pads 19), with theexception of a semiconductor device receiving area of the substrate 10.

[0009] In a subsequent step, a pattern of via openings 42 is created insolder mask 40, via openings 42 corresponding to portions of bond pads18 and contact pads 19 to which conductive elements, such as conductivewires 26 and solder balls 30, are respectively attached. To mask theareas over bond pads 18 and contact pads 19, solder mask 40 mustobviously be deposited in a thickness at least minimally greater thanthe height of bond pads 18 and contact pads 19. Typically, the soldermask used to cover substrate 10 is a photoimageable material that can beblanket deposited as a wet or dry film. By using photolithographicprocesses, vias or openings 42 of predetermined diameters are formed byexposing and developing a desired pattern on the resist areas through aphotoimaging mask, resulting in the removal of resist material and theexposure of bond pads 18 and contact pads 19.

[0010] Through a wire bonding process, conductive wires 26 extend frombond pads 24 of semiconductor device 20 through aperture 15 to bond pads18 located in the wirebonding area on terminal end portions of circuittraces 17 on or within substrate 10. Conductive wires 26 serve toelectrically connect the bond pads 24 of semiconductor device 20 tocontact pads 18 of substrate 10. In turn, bond pads 18 are electricallyconnected to contact pads 19 by circuit traces 17. Contact pads 19 arethen placed in contact with respective electrically conductive,connective elements such as solder balls 30. Alternatively, solder balls30 are placed directly upon, or in electrical communication with, thetermination point of a selected circuit trace 17. Solder balls 30 may befilled with any suitable metal, such as gold, although other conductivemetal-based solder balls or conductive filled epoxy materials arefrequently used. As illustrated in drawing FIG. 2, conductive wires 26,die bond pads 24, and bond pads 18 are shown covered with a layer ofprotective encapsulant 25. An encapsulant layer 25 is also showncovering the inactive backside surface of semiconductor device 20 andbottom surface 16 of substrate 10.

[0011] Bond pad geometries are typically formed as a standard roundshape. Because of the excellent self-centering property of solder ballinterconnections, BGA applications have significantly greatermisalignment tolerances than other interconnection techniques, such asquad flatpack leads. As such, relatively wide variations in solder ballplacement are accommodated during reflow of the solder joints.Generally, the rule of thumb is that solder balls must have a radialplacement accuracy wherein the solder is at least “half on pad.”

[0012] Generally, the types of bond pad layouts presently known in theart are Solder Mask Defined bond pad layouts and Non-Solder Mask Definedbond pad layouts. In Solder Mask Defined layouts of bond pads, theopening in the solder resist defining the solder ball mounting area ismade smaller than the copper, or any suitable type metal, bond paddisposed underneath. Thus, the solder mask overlaps with the edge of thecopper pad. This arrangement carries with it the advantage of providingbetter copper pad definition, since Solder Mask Defined layouts of bondpads are located by photoimaging, rather than by copper etching as isthe case for Non-Solder Mask Defined pads.

[0013] In contrast, bond pads which are formed by Non-Solder MaskDefined layouts of bond pads have a solder mask opening which is largerthan the copper pad, or any suitable type metal pad. In this situation,the size of the copper defines the size of the pad, and the size of thepad is determined by a copper etching process. Non-Solder Mask Definedlayouts of bond pads are considered less accurate than those determinedby solder mask photoimaging processes but offer advantages in thatvision system registration of copper fiducials gives an exact locationof the site so that any mis-registration error in regards tophotoimaging the Solder Mask Defined layouts of pads will shift thelocation of the entire site relative to the vision fiducials.

[0014] Referring again to drawing FIGS. 1 and 2, to bond the solderballs to contact pads 19, flux is typically applied to contact pads 19or to solder balls 30 and/or to both. Solder balls 30 are then placed inthe via openings 42 over contact pads 19, and the solder is reflowedinto a metallurgical solder bond. During the reflow process, the vias 42in solder mask 40 aid in positioning solder balls 30.

[0015] Contact pads 19 can be arranged in a grid array pattern whereinthe conductive elements or solder balls 30 of a preselected size, orsizes, are spaced away from each other at one or more preselecteddistances, or pitches. Typically, solder ball sizes can be approximately0.6 mm or less, and the solder balls may have a spacing, or pitch, ofapproximately 0.80 mm or less. When using tape substrates, high packagedensities with pitches approaching 0.05 mm are possible. In BGAarrangements using Plated Thru Hole (PTH) technology, consideration mustbe given to the placement of the bond pad. Bond pads which are placedtoo closely to a hole run the risk of solder melting and flowing intothe hole, the wicking of the solder potentially creating a situationwhere the solder does not wet the entire bond pad, thus creating an“open” for that lead.

[0016] In packages using FPBGA or μBGA patterns, contact pads 19 arespaced at very small distances from each other, resulting indimensionally small spacings or pitches for relatively small conductiveelements, or solder balls, 30 placed thereon.

[0017] Illustrated in drawing FIG. 3 is a top view of a portion of a BGApackage 1 containing an unencapsulated BGA package 1, prior tosingulation of BGA substrate 10. BGA substrate 10 is shown incorporatingthe use of a prior art alignment mark or fiducial 44 and a pin oneindicator 46. Used for accurate automated assembly, alignment marks orfiducials 44 and pin one indicator 46 are typically incorporated onupper surface 12 of substrate 10. Alignment marks or fiducials 44, forexample, ensure that substrate 10 is properly aligned and positioned forthe automated mounting of a semiconductor device 20. As shown in drawingFIG. 3, marks for this purpose are generally found aligned with thelateral edges and the center axis of the substrate area in whichsemiconductor device 20 is to be attached. Alignment marks or fiducials44, when set in “street lines,” may also be used for aligning a saw orother severing equipment to be used for the singulation or separation ofBGA packages. Generally, alignment marks or fiducials 44 for thealignment of singulation or severing equipment are disposed on aperipheral area of substrate 10; the peripheral area typically used as aclamping area during the encapsulation of semiconductor device 20 andits related interconnections within BGA package 1.

[0018] Pin one indicator 46 is used by automated die attach apparatus toorient semiconductor device 20 in the proper configuration. Pin oneindicator 46 is generally positioned in close proximity to thesemiconductor device mounting site in an area of the solder resist notoccupied by bond pads 18, contact pads 19, or circuit traces 17.

[0019] Typically, pin one indicator 46 and alignment marks or fiducials44 are formed as openings in the solder mask 40 (see drawing FIG. 2),allowing an underlying conductive feature (e.g., Cu, Au, Ni, etc.) toshow through. Thus, the conductive feature showing through typicallycomprises the same metal as that of the conductors (i.e., bond pads 18,contact pads 19, and circuit traces 17) formed over the substratesurface. Methods for forming the pin one indicator 46 and alignmentmarks or fiducial marks 44 include exposure by photolithographicprocesses and the use of lasers. The shape of pin one indicators 46 andalignment marks or fiducials 44 are known to vary in the art. As shownin drawing FIG. 3, a standard design for a pin one indicator 46 is atriangularly shaped opening in the solder resist, while a standarddesign for an alignment mark or fiducial 44 is typically formed fromopenings in the solder resist fashioned as an X-Y axis.

[0020] Generally, automated die attachment apparatus use a vision systemto locate a fiducial 44 and/or pin one indicator 46 on a substrate. Bydetecting the position of the fiducial 44 and pin one indicator 46, theposition and orientation of substrate 10 can be accurately detected.Fiducials and pin one indicators (not shown), such as fiducials 44 andpin one indicators 46 on substrate 10, can also typically be found onsemiconductor device 20 for orienting the semiconductor device 20 duringthe automated pick and place process. The vision system uses thesemiconductor device fiducials and substrate fiducials 44 and pin oneindicators 46 to check semiconductor device 20 position on the pickuptool and then drives the die attach apparatus to adjust the die tool andsubstrate position for accurate semiconductor device 20 placement. Arelatively simple system of vision recognition is the black and whitedigital recognition system (DRS). For a higher degree of sophisticationin recognition, a pattern recognition system (PRS) can be used as avision system.

[0021] Typically, the vision system reads the pin one indicator on thesolder resist by scanning for contrasts and adjusting the backlightingto achieve the proper reflection. Using an X-Y table for properalignment, the vision system checks the semiconductor device 20 positionon the die pickup tool and directs the die machine to adjust thesubstrate and die tool into the correct positions, using X, Y, and θ(theta) directions, for precise semiconductor device 20 placement.Typically, semiconductor dice are presented to a bonding machine inwafers which may be mounted on tape on metal frames. For some diebonding machines, semiconductor dice may also be presented in gel orwaffle packs. In the die bonding process, semiconductor dice areselectively picked from those of wafers respectively probe-tested intheir manufacturing process using various testing equipment. Meanwhile,a mounting substrate has been indexed to the die attach site where aprecise amount of adhesive, such as epoxy resin, is applied. Thepicked-up semiconductor device is then bonded to the die attach site ofthe mounting substrate via the adhesive. After the semiconductor device20 has been adhesively mounted to the mounting substrate, a wire bondingprocess can take place.

[0022] Still referring to drawing FIG. 3, an accurate placement ofsemiconductor die 20 is critical for good wire bonding. Therefore,separate pin one indicators 46 and/or alignment marks or fiducials 44must be used for each semiconductor device 20 in each multi-devicebonding area on a substrate 10. For wire bonding, sophisticated visionsystems are required to accurately and reliably position the vastnumbers of wire bonds to be made in a package manufacturing operation.Furthermore, the accuracy of placement of a ball bond is particularlycritical if using fine-pitch wire bonding technology. Therefore, PRSvision systems, in combination with alignment marks or fiducials 44, aretypically used. During the wirebonding process, a substrate 10 is movedand indexed from bonding site to bonding site through a clampingapparatus which retains the substrate at sequential bonding sites forproducing a plurality of wire-bonded semiconductor devices. In thisprocess, guide holes 21 may be used for coarse alignment, whilealignment marks or fiducials 44 are typically used to aid in precisealignment. In this process, the alignment marks or fiducials 44 may beformed separately from other alignment marks or fiducials which may beused for, e.g., die attach or saw singulation. Conductive wires 26extending from bond pads 24 of the active surface 22 of a semiconductordevice 20 are then bonded to bond pads 18 surrounding aperture 15.Several choices may be made in the particular wire bonding process to beused. The selection of the proper wire bonding process is generallybased on the pad pitch, device characteristics, and throughputrequirements. Typically, either thermosonic ball bonding or ultrasonicwedge bonding is used. While thermosonic gold ball wire bonding is usedfor the majority of fine-pitch wire bonding, ultrasonic gold or aluminumwedge wire bonding is used for pad pitches below 60 μm.

[0023] Subsequent to wire bonding, semiconductor device 20 and itsrelated electrical interconnections are subjected to a molding processwhere they are encapsulated to protect them from the outsideenvironment. Typically, encapsulation entails positioning substrate 10on a lower mold platen such that the portions to be encapsulated are inregistration with multiple mold cavities formed in the lower moldplaten. The mold is then closed when the upper platen, also containing amold cavity, is lowered onto the lower platen. When the mold is closed,a peripheral portion of substrate 10, usually containing fiducials oralignment marks 44, is typically compressed between the upper and lowerplatens to seal the mold cavities in order to prevent leakage ofliquified plastic molding compound. After wire bonding, individual orgroups of packages are separated from one another by a cutting process,typically making use of alignment marks or fiducials 44 for thepositioning of the singulation equipment to allow cutting along apackage edge.

[0024] Several disadvantages are known in the art with regard to the useof conventional pin one indicators 46 and alignment marks or fiducials44. First, while pin one indicators 46 and fiducial marks 44 arecompletely unnecessary for the operating characteristics of thecompleted BGA package, their presence disadvantageously takes upvaluable real estate on substrate 10. This is problematic since thetrend in industry today is towards smaller, yet denser packages.Foreseeably, higher density ball grid arrays will be used which will bepopulated so as to encroach on the package edge, resulting in smallerarray pitches and tighter dimensional controls. For example, industry isincreasingly moving towards widespread use of the “chip scale package,”in which the footprint of the package is only approximately twentypercent or less larger than that of the semiconductor device. Therefore,as BGA packages shrink and as density increases, it is desirable to makepin one indicators 46 and fiducials 44 as small as possible.Furthermore, large pin one indicator 46 and fiducial 44 openings in thesolder resist can interfere with the operation of defect scanning visionsystems. Finally, saw fiducials are typically placed in theencapsulation clamping areas where the non-planar solder resist surfacethat forms the fiducial can lead to resin bleed or flashing over thebond pads or contact pads during the molding process.

[0025] Accordingly, what is needed in the art are pin one indicators andfiducials which reduce the size of solder resist openings, therebytaking up a minimal amount of space and maintaining a substantiallyplanar solder resist substrate surface.

SUMMARY OF THE INVENTION

[0026] The present invention features a novel design for a fiducial andpin one indicator that utilizes a single solder resist opening in a diemounting substrate to perform the combined functions of prior artfiducials and pin one indicators. Methods of fabricating a carriersubstrate and fabricating a semiconductor device package using thecombination pin one indicator and alignment fiducial of the presentinvention are also provided. Preferably, the pin one indicator/alignmentfiducial comprises an “L”-shaped narrow opening in the solder mask layerin which two lines, substantially mutually perpendicular to one another,form components of an X-Y axis. In one embodiment, the combination pinone indicator/alignment fiducial is placed relatively closely adjacent(as compared to prior art pin one indicators and fiducials) an array ofcontact pads on a mounting substrate configured for receiving asemiconductor device. Preferably, the contact pads are arranged in adense array for forming a fine pitch ball grid array (FPBGA) or μBGA.The distinctive configuration of the combination fiducial/pin oneindicator is recognized by a vision system and allows for preciseorientation and alignment of a semiconductor device during die attach.The combination pin one indicator/alignment fiducial may also be usedfor alignment in wire bonding and as an alignment fiducial for asingulation saw or other substrate severing apparatus employed toseparate individual semiconductor device packages from a substratearray.

[0027] In a preferred embodiment, the pin one indicator/alignmentfiducial of the present invention is solder mask defined by use of alaser to produce a highly defined and accurate mark. Photoimagingprocesses known in the art may also be used to define the pin oneindicator/alignment fiducial. Conventional photoimaging methods mayfurther be combined with stereolithographic processes to tighten soldermask exposure around the pin one indicator/alignment fiducial and thecontact pads of a ball grid array.

[0028] The pin one indicator/alignment fiducial of the present inventionfurther provides only a minimal opening in the solder resist, thusallowing for smaller pitches between solder balls and tighterdimensional controls. Therefore, the present invention is particularlyuseful for packages in which the solder resist surface of the mountingsubstrate is heavily populated with contact pads and/or solder balls,and/or in applications where the semiconductor device outline is nearlythe same size as the package (e.g., Chip Scale Packages (CSP), Near ChipSize (NCS), etc.).

[0029] Other features and advantages of the present invention willbecome apparent to those of skill in the art through a consideration ofthe ensuing description, the accompanying drawings, and the appendedclaims.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0030] In the drawings, which illustrate what is currently considered tobe the best mode for carrying out the invention:

[0031]FIG. 1 illustrates a top view of a prior art “board-on-chip” BGApackage;

[0032]FIG. 2 illustrates a schematic cross-sectional view of a prior art“board-on-chip” BGA package;

[0033]FIG. 3 illustrates a top view of a representative BGA substrateincorporating the use of a prior art alignment mark or fiducial and apin one indicator;

[0034]FIG. 4 is an overhead view of a simplified BGA substrate arraywith the combination pin one indicator and fiducial configured thereon;

[0035]FIG. 5A is an embodiment of the preferred geometric shape of thecombination pin one indicator and alignment fiducial of the presentinvention;

[0036]FIG. 5B is an example of an embodiment of the combination pin oneindicator and alignment fiducial of the present invention;

[0037]FIG. 5C is an example of an embodiment of the combination pin oneindicator and alignment fiducial of the present invention;

[0038]FIG. 6 is a simplified top view diagram of a portion of a BGAsubstrate showing a plurality of conductors formed on the substrate in apreselected grid array pattern prior to the deposition of a solder masklayer;

[0039]FIGS. 7A through 7F are schematic cross-sectional viewsillustrating various processing steps during the fabrication of acarrier substrate and a semiconductor device package;

[0040]FIG. 8 illustrates a BGA substrate having a chip scale package anda combination pin one indicator and alignment fiducial prior tosingulation; and

[0041]FIG. 9 shows a representative singulated chip scale package formedby the methods of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0042] A combination pin one indicator and alignment fiducial forautomated die attach processes and substrate singulation is disclosed.In the following description, numerous specific details are set forth toprovide a thorough understanding of the present invention. It will beapparent, however, to one of ordinary skill in the art that the specificdetails need not be employed in order to practice the present invention.In other instances, well-known materials or methods have not beendescribed in detail in order to avoid obscuring the invention.

[0043] The present invention features a novel design for a pin oneindicator and alignment fiducial that utilizes a single solder resist(also referred to herein as “solder mask”) opening in a die mountingsubstrate (also referred to herein as a “carrier substrate”) to performthe combined functions of prior art alignment fiducials and pin oneindicators. The present invention further includes a carrier substrateconfigured with the combination pin one indicator and alignmentfiducial, as well as methods of fabricating a semiconductor devicepackage and a semiconductor carrier substrate using the novelcombination pin one indicator and alignment fiducial.

[0044] As used herein, the term “combination pin one indicator andalignment fiducial” (also referred to herein as a “pin oneindicator/alignment fiducial”) generally refers to a mark in a soldermask surface associated with each die attach site of a mountingsubstrate, and which is configured with at least one axis suitable forboth alignment of a semiconductor device during semiconductor die attachand alignment of a singulation saw or other severing apparatus duringsingulation of a package from a mounting substrate. The combination pinone indicator and fiducial may also be used for alignment of a mountingsubstrate and wire bonding or lead bonding apparatus during wire bondingor lead bonding operations. The term “combination pin one indicator andalignment fiducial” will be further clarified when considering theembodiments disclosed below.

[0045] In one embodiment, the combination pin one indicator/alignmentfiducial is provided as disposed proximate a BGA of a mountingsubstrate. Preferably, the combination pin one indicator/alignmentfiducial will be disposed adjacent a BGA of a substrate surfaceconfigured for forming a chip scale or other relatively denselypopulated package known in the art. The distinctive configuration of thecombination pin one indicator/alignment fiducial can be recognized by avision system and allows for precise alignment of a semiconductor deviceduring die attach. The combination pin one indicator/alignment fiducialmay also be used as a saw fiducial for a singulation saw employed toseparate individual packages on a substrate array. In a preferredembodiment, the pin one indicator/alignment fiducial of the presentinvention is solder mask-defined by use of a laser to produce a highlydefined and accurate mark. One of skill in the art will recognize thatvarious lasers are available for this purpose, including YAG lasers,excimer lasers, and carbon dioxide lasers. Photoimaging processes knownin the art may also be used to define the pin one indicator/alignmentfiducial.

[0046] Referring to drawing FIG. 4, and in accordance with an embodimentof the present invention, illustrated is a top view of a simplified BGAsubstrate 50. BGA substrate 50 includes a first surface 52 and anopposing second surface (not shown). Although only first surface 52 isshown, it is understood by one of skill in the art that the secondsurface of BGA substrate 50 may contain additional circuitry, such asconductors, and/or additional devices. As used herein, the term“conductors” refers to conductive metal placed on a mounting substratesurface. Thus, “conductors” may refer to contact pads, circuit traces,and any other type of conductive metal regions, pads or areas providedon a mounting substrate. On the first surface 52, shown as the uppersurface of BGA substrate 50, an array of semiconductor device receivingsites or areas 64 for the mounting of a semiconductor device isprovided. Surrounding each of the semiconductor device receiving sites64 are connective elements forming a ball grid array 62, the ball gridarray 62 being formed of a plurality of connective elements forelectrically connecting a completed semiconductor device package to anexternal component, such as a module board or a second BGA semiconductordevice package. The connective elements of each ball grid array 62comprise contact pads (not shown) with solder balls 60 disposed thereon.Although solder balls 60 are not typically placed on contact pads untilafter a die attach and encapsulation process, solder balls 60 areincluded for ease of illustrating a representative BGA substrate. As canbe seen in drawing FIG. 4, the connective elements are arranged in apreselected grid array pattern. On a corner perimeter region adjacenteach ball grid array 62 in the substrate array, and in the cornerassociated with pin one placement for a semiconductor device to beplaced on a semiconductor device receiving site 64, a pin oneindicator/alignment fiducial 54 configured in accordance with theprinciples of the present invention is shown.

[0047] Preferably, pin one indicator/alignment fiducial 54 comprises an“L”-shaped and narrow opening in the solder mask layer 80 in which twolines, substantially mutually perpendicular to one another, formcomponents of an X-Y axis. The “L” shape of pin one indicator/alignmentfiducial 54 can be inverted and/or spatially rotated to serve thepurposes of the present invention. Illustrated in drawing FIG. 5A is anexample of the preferred configuration for pin one indicator/alignmentfiducial 54. Of the substantially mutually perpendicular lines, theaspect of the solder mask opening extending along the X axis is used forsubstrate position detection and alignment in the X direction, while theaspect of the solder mask opening extending along the Y axis is used forsubstrate position detection and alignment in the Y direction. Pin oneindicator/alignment fiducial 54 is shown placed closely adjacent thearray of solder mask-defined contact pads 59. A conductor pad 55, overwhich pin one indicator/alignment fiducial 54 is formed, is shown inoutline form underlying solder mask layer 80, thus illustrating apreferred embodiment in which pin one indicator/alignment fiducial 54 issolder mask-defined. Circuit traces 57 are shown in electrical contactwith contact pads 59 at one end and are extending towards contact pads58 (not shown) at an opposing end in furtherance of an electricalcircuit. Contact pads 59 are also illustrated as solder mask-defined,with the portion of each contact pad 59 underlying solder mask layer 80represented in outline form.

[0048] As can best be seen in drawing FIG. 3, the location of pin oneindicator/alignment fiducial 54 can correspond to one or more exposedfeatures on a carrier substrate. For example, one or more edge portionsof pin one indicator/alignment fiducial 54 can be aligned with an axisof a conductive element and/or an edge of a semiconductor device tofurther enhance alignment capabilities.

[0049] Advantageously, the distinctive shape of pin oneindicator/alignment fiducial 54 can be easily read by a vision systemfor proper orientation and alignment during die attach, the relativelynarrow openings in the solder mask layer which form pin oneindicator/alignment fiducial 54 serving to maximize the amount of realestate which can be used for substrate interconnections or othercircuitry, such as for a densely populated BGA. The minimal opening inthe solder mask layer further provides a more planar surface duringclamping in the molding process, thus reducing resin bleed and flashing.

[0050] Additionally, pin one indicator/alignment fiducial 54 may be usedto align a singulation saw or other substrate severing apparatus duringsingulation of individual semiconductor device packages. For example, asingulation saw can cut along one or both of the X or Y aspects of pinone indicator/alignment fiducial 54 wherein the X or Y aspects willform, or be closely associated with, package edges of an individualsemiconductor device package. Thus, the placement of the soldermask-defined pin one indicator/alignment fiducial 54 in close proximityto the array of contact pads 59 and circuit traces 57 allows for a sawedge to be aligned with relatively tight tolerances to the solder maskopenings around contact pads 59. In addition to maximizing the amount ofreal estate used per semiconductor device package, one of skill in theart will recognize that tight tolerances at the edge of a semiconductordevice package are important for various electronic testingapplications.

[0051] It will be understood by one of skill in the art that pin oneindicator/alignment fiducial 54 is not limited to the “L” shapedescribed, but rather the critical factor in the configuration of pinone indicator/alignment fiducial 54 is that it allows for accuratealignment and orientation processes while providing only a minimalopening in the solder resist. Therefore, one of skill in the art willrecognize that the pin one indicator/alignment fiducial of the presentinvention may be configured in a variety of other shapes which providesuitably minimal openings in the solder resist while still performingthe combined functions of a pin one indicator and an alignment fiducial.Examples of geometrically different combination pin one indicator andalignment fiducials are illustrated in drawing FIGS. 5B and 5C. Theseembodiments include a third axis, θ, extending in a substantiallyforty-five degree (45°) angle from a point of intersection between the Xand Y axes. Furthermore, while the combination pin one indicator andalignment fiducial of the present invention is preferably formed as acontiguous mark, recess or other opening in the solder mask layer, thecombination pin one indicator and alignment fiducial may be formed of acombination of closely spaced marks, recesses or other openings in thesolder resist grouped in such close proximity so as to be considered asingle alignment feature, albeit serving multiple functions.

[0052] As pin one indicator/alignment fiducial 54 of the presentinvention is configured to provide only a minimal opening in the solderresist, smaller pitches between solder balls and tighter dimensionalcontrols are possible. Therefore, the present invention is particularlyuseful for packages in which the solder resist surface of the mountingsubstrate is heavily populated with contact pads and/or solder balls,and in applications where the semiconductor device outline is nearly thesame size as the singulated semiconductor device package (e.g., ChipScale Packages (CSP), Near Chip Size Packages (NCS), etc.).

[0053] One of skill in the art will recognize that pin oneindicator/alignment fiducial 54 has widespread applicability in the artof semiconductor packaging. In addition to the various types of ballgrid arrays (FBGA, μBGA, low profile fine-pitch ball grid array(LPFPBGA), etc.) known in the art to be used for externalinterconnection of the chip package to, e.g., printed wiring boards,other IC chip packages, multi-chip modules, etc., the pin oneindicator/alignment fiducial 54 of the present invention is useful forthe construction of chip packages incorporating numerous other types ofexternal interconnection arrays, such as pin connectors or wire bonds.Pin one indicator/alignment fiducial 54 can be used in packagesutilizing a myriad of surface mount configurations, such as flip-chip,quad flatpack (QFP), etc., as well as chip packages designed formulti-chip stacking.

[0054] Referring again to drawing FIG. 4, BGA substrate 50 generallycomprises an electrically insulating material. In one embodiment, BGAsubstrate 50 comprises a polymer laminate circuit board. BGA substrate50 may also be formed of a variety of other materials, however,including, but not limited to ceramics, metal (including metalleadframes), plastics, various organics, or combinations thereof, etc.BGA substrate 50 may be formed with or without cavities or recessedareas as the semiconductor device receiving areas 64. BGA substrate 50may also be formed with a plurality of apertures therethrough to allowfor construction of a board-on-chip array as previously described and asillustrated in FIG. 1. BGA substrate 50 may be configured with one ormore semiconductor device receiving areas 64 formed on either the firstsurface 52 or the opposing second surface of the BGA substrate 50.

[0055] Methods of fabricating a carrier substrate and a semiconductordevice package using the combination pin one indicator and alignmentfiducial of the present invention will now be explained in more detail.Referring to drawing FIG. 6, a simplified diagram of a portion of BGAsubstrate 50 is shown with a plurality of conductors (pads 54 a, circuittraces 57, contact pads 58, and contact pads 59) formed on the surfaceof the substrate prior to the deposition of a solder mask layer. Some ofthe conductors (contact pads 59) are provided in a preselected gridarray pattern. Although the following steps will be described on asingle substrate portion, in actual practice, the steps would be carriedout on a plurality of substrate arrays configured for mounting aplurality of semiconductor dice. The conductors, which will underlie aninsulating layer of solder mask, are formed adjacent a semiconductordevice receiving area 64 and initially comprise a conductive metal whichhas been blanket deposited onto BGA substrate 50 by, for example,electroless or electrolytic plating. Subsequent to deposition of themetal layer, the conductors may be defined, for example, by an etchingprocess. The required pattern of the conductors may also be formed byother methods known in the art, such as by electroless plating through apatterned mask. The conductors may comprise pad circuit traces 57,contact pads 58, and contact pads 59. Circuit traces 57 serve to providean electrical connection between a respective plurality of contact pads58 and contact pads 59. For substrates densely populated withconductors, circuit traces 57 are typically 8 mils wide or less. Theconductors are preferably comprised of copper or aluminum, but may becomprised of any other electrically conductive materials known in theart, such as titanium, tungsten, gold, etc. Also shown in drawing FIG. 6is an additional conductor segment or pad formed as a small area ofconductive metal 54 a which has been etched or plated closely adjacentthe patterned conductors. In one embodiment, the small region ofconductive metal 54 a will serve as a feature underlying a solder maskopening that defines the pin one/alignment fiducial 54 of the presentinvention. Alternatively, a solder ball contact pad 59, or otherconductor formed in a pattern of conductors on BGA substrate 50, mayserve as an underlying feature of pin one indicator/alignment fiducial54.

[0056] Referring to drawing FIG. 7A, a layer of solder mask material 80has been formed over first (upper) surface 52 of BGA substrate 50 so asto cover each of the conductors 61 (e.g., circuit traces, bond pads,solder ball contact pads, or other conductive pads). A solder mask layer80 a may also be formed over the second (bottom) surface 56 of BGAsubstrate 50, dependent upon the presence or proximity of conductors orother circuitry thereon. Solder mask layer 80 is initially formed as aplanar coat over substantially all portions of first surface 52 andbottom surface 56 of BGA substrate 50. Solder mask layer 80 mayalternatively be applied to cover all portions of first surface 52except for the semiconductor device receiving area 64. Solder mask layer80 may be laminated, screen printed, sputtered, deposited by chemicalvapor deposition, or otherwise formed by any means known in the art.Solder mask layer 80 is disposed over conductors 61 in a thickness andcomposition that shields conductors 61 on the first surface 52 fromelectrical shorts that might result, for example, from subsequentsoldering or plating operations. Preferably, solder mask layer 80 isdeposited in a thickness sufficient to cover each of contact pads 58 andcontact pads 59, such that solder mask-defined pads, as previouslydescribed, can be formed through vias in the solder mask layer 80. Arepresentative thickness of a solder mask layer 80 typically suitablefor use in the present invention is from about 1 to about 4 mils.Preferably, a photoimageable dielectric material is used as the soldermask material. Solder mask materials are commercially available for thispurpose. Solder mask materials found under the tradenames “PSR-4000” and“Au55,” manufactured by Taiyo America, Inc., Carson City, Nev., are twosuch suitable solder mask materials. Materials that can be ablated by alaser without blistering or bubbling are also preferred. A solder maskmaterial comprised of polytetrafluoroethylene (PFTE) is one materialsuitable for use with a laser.

[0057] Following deposition of solder mask layers 80 and 80 a, thephotoimageable mask materials may be partially hardened at an elevatedtemperature (such as 95° C.) by a prebaking step, then exposed in adesired pattern by using UV light and a suitable mask. As arepresentative desired pattern, a mask for exposing solder mask layer 80may expose and develop solder mask layer 80 such that openings or viasare formed in the solder mask layer 80 that expose contact pads 58,contact pads 59, pin one indicator/alignment fiducial 54, andsemiconductor device receiving sites 64, as is shown in drawing FIG. 7B.

[0058] Preferably, the photoimaged openings in solder mask layer 80 overcontact pads 59 and pin one indicator/alignment fiducial 54 are madesmaller than the copper or conductive metal regions disposed underneath,making contact pads 59 and pin one indicator/alignment fiducial 54solder mask-defined. In this embodiment, as is shown in drawing FIG. 7C,an area of solder mask preferably overlaps with the edges of the coppercontact pads 59 and the additional conductor segment formed as a smallarea of conductive metal 54 a. A representative overlap for a 23 mil paddiameter would be about 4 mils. In a further embodiment, a soldermask-defined opening defining pin one indicator/alignment fiducial 54can be made by placing a mask or stencil over BGA substrate 50 and inregistration with either the small region of conductive metal 54 a, acontact pad 59, or other conductive feature underlying solder mask layer80, then irradiating laser light through the opening. In a mostpreferred embodiment, a stereolithographic process, using a computerized3D image of the desired solder mask layer 80 surface in combination witha laser beam to solidify photosensitive polymer liquid in the desiredstructure, can be used to tighten solder mask exposure in forming thecontact pads 59 and pin one indicator/alignment fiducial 54.Stereolithography can be used instead of, or preferably in addition to,conventional photoimaging techniques or other techniques to form thesolder mask surface and openings of solder mask layer 80.

[0059] Following formation of solder mask layer 80, and the variouscontact pad 59, contact pad 58, pin one indicator/alignment fiducial 54and semiconductor device receiving area 64 openings therethrough, aprocess of die attach is conducted. Reference is made to drawing FIG. 7Bas representative of a BGA substrate 50 prepared for a die attachprocess. Illustrated in drawing FIG. 7D is an attached semiconductordevice 70. In die attach, a die bonder's vision system determines dieplacement and precise adhesive dispensing by locating the distinctiveconfiguration of pin one indicator/alignment fiducial 54, dispensing aprecise amount of adhesive onto the correct location on semiconductordevice receiving area 64, orienting a semiconductor die according to thepin one mounting area as shown by the location of pin oneindicator/alignment fiducial 54, then driving the die bonding machine toadjust the substrate and die tool position for accurate placement andmounting of the semiconductor die. For some vision system apparatus, thebacklighting may be adjusted to obtain an optimum reflective contrastbetween pin one indicator/alignment fiducial 54 and the surrounding areaof BGA substrate 50. Due to the minimal opening in the solder mask layer80 afforded by pin one indicator/alignment fiducial 54, a sophisticatedvision system, such as PRS, is preferred for recognition of pin oneindicator/alignment fiducial 54.

[0060] As shown in drawing FIG. 7D, after attaching semiconductor device70 to BGA substrate 50, conductive wires 72 can be wire bonded tocontact pads 58 of BGA substrate 50 and to corresponding bond pads 74 ofsemiconductor device 70. In this process, the vision system of aconventional wire bonding machine may utilize pin oneindicator/alignment fiducial 54 for alignment purposes. The pin oneindicator/alignment fiducial 54 of the present invention may also beused for alignment in a lead bonding process for mounted chips usingleads, instead of wires, for interconnection with corresponding leads ofa substrate.

[0061] As shown in drawing FIG. 7E, the wire interconnections(comprising conductive wires 72, contact pads 58 of BGA substrate 50,and corresponding bond pads 74 of semiconductor device 70) andsemiconductor device 70 are encapsulated by, for example, moldingcompound 67 dispensed during a transfer molding encapsulation process.Due to the minimal opening in solder mask layer 80 afforded by pin oneindicator/alignment fiducial 54, a more planar surface is created in theclamping area of BGA substrate 50, thus reducing the chances of resinbleed and flashing during the molding process.

[0062] Referring to drawing FIG. 7F, following an encapsulation process,solder balls 60 can be bonded to contact pads 59 by, for example, thedeposition of a solder flux on solder balls 60 and contact pads 59 incombination with a solder reflow process. The solder mask-definedopenings over contact pads 59 facilitate alignment of solder balls 60 tocontact pads 59, protect against solder ball 60 movement in thedirection of an associated circuit trace 57, and insulate solder balls60 from other conductors underlying solder mask layer 80. The additionof solder balls 60 to contact pads 59 completes an individual BGA chippackage.

[0063] To singulate an individual chip package from BGA substrate 50,pin one indicator/alignment fiducial 54 may be used in the alignment ofa singulation saw. In this regard, a vision system recognizes pin oneindicator/alignment fiducial 54 and directs a singulation saw to cutalong BGA substrate 50 according to predetermined instructionsassociated with the X-Y axis of pin one indicator/alignment fiducial 54.In a related embodiment, the singulation saw may cut along one or bothof the X or Y aspects of pin one indicator/alignment fiducial 54 whereinthe X or Y aspects will form, or be closely associated with, packageedges of an individual package. Such may allow for greater control ofthe relationship of the package edges relative to solder balls 60 placedon contact pads 59.

[0064] As previously discussed, the pin one indicator/alignment fiducialof the present invention is most preferably used in association withchip scale packages, near chip scale packages, or other packages havingdense arrays of conductors and interconnections. In drawing FIG. 8, apin one indicator/alignment fiducial 154 is shown forming a package edgeof a BGA substrate 150, wherein BGA substrate 150 is representative of acarrier substrate having at least one chip scale package formed thereon.As used herein, a “chip scale package” is defined as a surface mountablechip package which has an area that is no more than 1.2 times the areaof the original semiconductor device. As referred to herein, a near chipscale package is one in which the package size is relatively slightlylarger than 1.2 times the original semiconductor device size. Pin oneindicator/alignment fiducial 154 is shown placed on a perimeter regionoutside of solder balls 160 and solder mask-defined contact pads (notshown). Solder balls 160 are shown disposed on respective contact padslocated to form a ball grid array 162. The location of pin oneindicator/alignment fiducial 154 further corresponds to a corner of BGAsubstrate 150 outside of the ball grid array 162 in closest proximity tothe pin one mounting area for the pin one (not shown) of a semiconductordie 120. The positioning of pin one indicator/alignment fiducial 154 canbe further said to correspond to a package edge 151 of a severableportion of BGA substrate 150. As referred to herein, a “package edge”means an edge of a semiconductor device package which is formed, orwhich can be formed, by severing a severable portion of a carriersubstrate. Package edge 151 is shown in outline form, since thesemiconductor device package has yet to be severed from BGA substrate150. In this embodiment, a singulation saw can be aligned with pin oneindicator/alignment fiducial 154 to cut along imaginary lines extendingthrough, or immediately adjacent to, both the X and Y axes of pin oneindicator/alignment fiducial 154 and along two severable edges (packageedges) of BGA substrate 150. A chip scale package 200 singulated by thepresent method is shown in drawing FIG. 9.

[0065] It will be appreciated by those skilled in the art that theembodiments herein described, while illustrating certain embodiments,are not intended to so limit the invention or the scope of the appendedclaims. Those skilled in the art will also understand that variouscombinations or modifications of the preferred embodiments could be madewithout departing from the scope of the invention.

[0066] For example, this invention, while being described with referenceto an electrically conductive substrate used for the mounting ofsemiconductor dice, has equal utility to any type of solder mask-coatedsubstrate to be inscribed with fiducial marks and/or used in asemiconductor device mounting process. As one example, the pin oneindicator/alignment fiducial of the present invention may be applied tothe inactive side of a semiconductor die for orienting and aligning thesemiconductor die during die attach. The embodiments of the presentinvention are also contemplated for use on wafer surfaces, includingbumped wafer surfaces in particular, and can be applied at any stage inthe semiconductor fabrication process. In addition, the pin oneindicator/alignment fiducial may be applied to encapsulatedsemiconductor packages for various orientation and alignment processes,such as the mounting of a first BGA package to a second BGA package, orthe mounting of a BGA package to a module board, such as a boardcomprising a memory module.

[0067] Thus, while certain representative embodiments and details havebeen shown for purposes of illustrating the invention, it will beapparent to those skilled in the art that various changes in theinvention disclosed herein may be made without departing from the scopeof the invention, which is defined in the appended claims.

What is claimed is:
 1. A method of fabricating a carrier substrate formounting at least one semiconductor device, comprising: providing asubstrate having a first surface and a second surface; providing atleast one semiconductor device attach site on at least one of the firstsurface and the second surface; forming a plurality of conductors on atleast one of the first surface and the second surface; disposing asolder mask layer on at least part of the at least one of the firstsurface and the second surface; and providing an opening in the soldermask layer serving as a combination pin one indicator and alignmentfiducial for both aligning a semiconductor device during a die attachprocess and for aligning a severing device for singulating thesubstrate.
 2. The method of claim 1, wherein providing the at least onesemiconductor device attach site comprises providing a plurality ofsemiconductor device attach sites, and wherein forming the plurality ofconductors comprises forming a plurality of conductors associated witheach of the plurality of semiconductor device attach sites.
 3. Themethod of claim 2, wherein disposing the solder mask layer comprisesdisposing a solder mask layer on an area associated with each of theplurality of semiconductor device attach sites, and wherein providingthe opening in the solder mask layer comprises providing an opening in asolder mask area associated with each of the plurality of semiconductordevice attach sites.
 4. The method of claim 3, wherein forming theplurality of conductors comprises forming a plurality of interconnectedbond pads, circuit traces and solder ball contact pads associated witheach of the plurality of semiconductor device attach sites.
 5. Themethod of claim 4, wherein forming the plurality of solder ball contactpads further comprises arranging at least some of the solder ballcontact pads in a preselected grid array pattern.
 6. The method of claim5, wherein arranging the at least some of the solder ball contact padsin the preselected grid array pattern includes locating the preselectedgrid array pattern adjacent at least one severable portion of thesubstrate.
 7. The method of claim 6, wherein disposing the solder masklayer comprises disposing the solder mask layer over the plurality ofconductors.
 8. The method of claim 7, further comprising forming vias inthe solder mask layer over the solder ball contact pads in thepreselected grid array pattern, said vias comprising solder mask-definedvias.
 9. The method of claim 7, wherein providing the opening in thesolder mask layer comprises providing an opening located over one of theplurality of conductors.
 10. The method of claim 9, wherein providingthe opening in the solder mask layer comprises forming an opening in thesolder mask layer using photolithographic techniques.
 11. The method ofclaim 9, wherein providing the opening in the solder mask layercomprises directing a laser light at the solder mask layer.
 12. Themethod of claim 10, wherein providing the opening in the solder masklayer further comprises narrowing one or more sidewall areas of theopening using stereolithographic techniques.
 13. The method of claim 9,wherein providing the opening in the solder mask layer further comprisesconfiguring the combination pin one indicator and aligment fiducial astwo substantially mutually perpendicular lines forming components of anX axis and a Y axis.
 14. The method of claim 6, wherein providing theopening in the solder mask layer comprises locating the combination pinone indicator and alignment fiducial in an area adjacent the preselectedgrid array pattern.
 15. The method of claim 14, wherein locating thecombination pin one indicator and alignment fiducial in an area adjacentthe preselected grid array pattern comprises locating the combinationpin one indicator and alignment fiducial adjacent at least one severableportion of the substrate.
 16. The method of claim 15, wherein locatingthe combination pin one indicator and alignment fiducial in an areaadjacent the preselected grid array pattern comprises locating thecombination pin one indicator and alignment fiducial on at least oneseverable package edge of the at least one severable portion of thesubstrate.
 17. The method of claim 2, wherein providing the plurality ofsemiconductor device attach sites and forming the plurality ofconductors associated with each of the plurality of semiconductor deviceattach sites comprises configuring the substrate for producing aplurality of ball grid array chip scale packages.
 18. The method ofclaim 2, wherein providing the plurality of semiconductor device attachsites and forming the plurality of conductors associated with each ofthe plurality of semiconductor device attach sites comprises configuringthe substrate for producing a plurality of near chip scale packages. 19.A method of fabricating a carrier substrate having a first surface and asecond surface for mounting at least one semiconductor device,comprising: forming at least one semiconductor device attach site on atleast one of the first surface and the second surface; forming aplurality of conductors on at least one of the first surface and thesecond surface; disposing a solder mask layer on at least part of the atleast one of the first surface and the second surface; and providing anopening in the solder mask layer serving as a combination pin oneindicator and alignment fiducial for both aligning a semiconductordevice during a die attach process and for aligning a severing devicefor singulating the substrate.
 20. The method of claim 19, whereinproviding the at least one semiconductor device attach site comprisesproviding a plurality of semiconductor device attach sites, and whereinforming the plurality of conductors comprises forming a plurality ofconductors associated with each of the plurality of semiconductor deviceattach sites.
 21. The method of claim 20, wherein disposing the soldermask layer comprises disposing a solder mask layer on an area associatedwith each of the plurality of semiconductor device attach sites, andwherein providing the opening in the solder mask layer comprisesproviding an opening in a solder mask area associated with each of theplurality of semiconductor device attach sites.
 22. The method of claim21, wherein forming the plurality of conductors comprises forming aplurality of interconnected bond pads, circuit traces and solder ballcontact pads associated with each of the plurality of semiconductordevice attach sites.
 23. The method of claim 22, wherein forming theplurality of solder ball contact pads further comprises arranging atleast some of the solder ball contact pads in a preselected grid arraypattern.
 24. The method of claim 23, wherein arranging the at least someof the solder ball contact pads in the preselected grid array patternincludes locating the preselected grid array pattern adjacent at leastone severable portion of the substrate.
 25. The method of claim 24,wherein disposing the solder mask layer comprises disposing the soldermask layer over the plurality of conductors.
 26. The method of claim 25,further comprising forming vias in the solder mask layer over the solderball contact pads in the preselected grid array pattern, said viascomprising solder mask-defined vias.
 27. The method of claim 24, whereinproviding the opening in the solder mask layer comprises providing anopening located over one of the plurality of conductors.
 28. The methodof claim 27, wherein providing the opening in the solder mask layercomprises forming an opening in the solder mask layer usingphotolithographic techniques.
 29. The method of claim 27, whereinproviding the opening in the solder mask layer comprises directing alaser light at the solder mask layer.
 30. The method of claim 28,wherein providing the opening in the solder mask layer further comprisesnarrowing one or more sidewall areas of the opening usingstereolithographic techniques.
 31. The method of claim 27, whereinproviding the opening in the solder mask layer further comprisesconfiguring the combination pin one indicator and alignment fiducial astwo substantially mutually perpendicular lines forming components of anX axis and a Y axis.
 32. The method of claim 24, wherein providing theopening in the solder mask layer comprises locating the combination pinone indicator and alignment fiducial in an area adjacent the preselectedgrid array pattern.
 33. The method of claim 32, wherein locating thecombination pin one indicator and alignment fiducial in an area adjacentthe preselected grid array pattern comprises locating the combinationpin one indicator and alignment fiducial adjacent at least one severableportion of the substrate.
 34. The method of claim 33, wherein locatingthe combination pin one indicator and alignment fiducial in an areaadjacent the preselected grid array pattern comprises locating thecombination pin one indicator and alignment fiducial on at least oneseverable package edge of the at least one severable portion of thesubstrate.
 35. The method of claim 20, wherein providing the pluralityof semiconductor device attach sites and forming the plurality ofconductors associated with each of the plurality of semiconductor deviceattach sites comprises configuring the substrate for producing aplurality of ball grid array chip scale packages.
 36. The method ofclaim 20, wherein providing the plurality of semiconductor device attachsites and forming the plurality of conductors associated with each ofthe plurality of semiconductor device attach sites comprises configuringthe substrate for producing a plurality of near chip scale packages.